状態推移法によるサイリスタ無整流子電動機の解析

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  • Analysis of Thyristor Commutatorless Motor Using State Transition Method

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It is well known that a commutatorless motor is constructed with a 180°-type three-phase thyristor inverter, a synchronous motor and a phase angle detector.<br>In this paper, we propose a method to analyze this commutatorless motor, using the “state transition method”. This method enables us to analyze the characteristics of a commutatorless motor directly in time domain. We can analyze by this method, not only the stationary characteristics of a commutatorless motor, but also the transient characteristics when the input voltage changes instantaneously.<br>We also show that the power factor of a commutatorless motor can be optimized by the regulation of the field current in the same manner as done with a synchronous motor.<br>An experiment is performed with a 1kW class commutatorless motor. The experimental results of the starting torque, the input and output current wave forms of the inverter and the curves of phase characteristics agree well with the theoretical results by the analysis mentioned above.

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